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(dired-x)Special Marking Function

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Special Marking Function
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`M-('
     (`dired-mark-sexp') Mark files for which PREDICATE returns
     non-`nil'.  With a prefix argument, unflag those files instead.

     The PREDICATE is a lisp expression that can refer to the following
     symbols:
    `inode'
          [integer] the inode of the file (only for `ls -i' output)

    `s'
          [integer] the size of the file for `ls -s' output (usually in
          blocks or, with `-k', in KBytes)

    `mode'
          [string]  file permission bits, e.g., `-rw-r--r--'

    `nlink'
          [integer] number of links to file

    `uid'
          [string]  owner

    `gid'
          [string]  group  (If the gid is not displayed by `ls', this
          will still be set (to the same as uid))

    `size'
          [integer] file size in bytes

    `time'
          [string]  the time that `ls' displays, e.g., `Feb 12 14:17'

    `name'
          [string]  the name of the file

    `sym'
          [string]  if file is a symbolic link, the linked-to name,
          else `""'

     For example, use
          (equal 0 size)
     to mark all zero length files.

     To find out all not yet compiled Emacs lisp files in a directory,
     Dired all `.el' files in the lisp directory using the wildcard
     `*.el'.  Then use `M-(' with
          (not (file-exists-p (concat name "c")))
     to mark all `.el' files without a corresponding `.elc' file.